文献类型：期刊文献

英文题名：Catalytic effects of Na2CO3 additive on coal pyrolysis and gasification

作者：Ding, Lu[1];Zhou, Zhijie[1];Guo, Qinghua[1];Huo, Wei[1];Yu, Guangsuo[1]

机构：[1]E China Univ Sci & Technol, Shanghai Engn Res Ctr Coal Gasificat, Key Lab Coal Gasificat & Energy Chem Engn, Minist Educ, Shanghai 200237, Peoples R China

年份：2015

卷号：142

起止页码：134

外文期刊名：FUEL

收录：;EI(收录号：20144800249009);WOS:【SCI-EXPANDED(收录号:WOS:000345699100018)】；

基金：This work has been partially supported by the National High Technology Research and Development of China (863 program, 2012AA053101), the National Key State Basic Research Development Program of China (973 program, 2010CB227004) and the National Natural Science Foundation of China (21376081).

语种：英文

外文关键词：In-situ heating stage; Catalytic pyrolysis; Gasification; Na2CO3; Interactions

摘要：Catalytic pyrolysis and gasification characteristics of coal using Na2CO3 as a catalyst were studied in a high-frequency furnace and thermogravimetric analyzers (TGA), respectively. Interactions of Na2CO3 with carbon at both pyrolysis and gasification phases were observed by in-situ heating stage microscope. The effects of pyrolysis temperature (650-800 degrees C) and catalyst loading amount (0-15 wt.%) on the associated pyrolysis and gasification processes were investigated. The results show that, H-2 and CO are the main pyrolysis gas products and the yields of these two gas increase with the increasing of Na2CO3 in the range of 0-15 wt.%. The in-situ heating stage experiments indicated that one main gasification reaction form was observed for Shenfu char samples. Most of SF char particles reacted with CO2 in the form of shrinking core mode without cracking, and certain particles presented fragmentation phenomenon in the reaction process. There is an optimal loading amount of Na2CO3 for the best catalytic gasification effect of Shenfu bituminous char, while Na2CO3 does not reach the saturation amount for the catalytic gasification of Zunyi anthracite coal. The activation energy of catalytic Shenfu coal gasification with 10 wt.% Na2CO3 is 31.5 kJ mol(-1) less than that of non-catalytic coal gasification, which indicates that Na2CO3 can improve the kinetics of coal gasification with CO2. (C) 2014 Elsevier Ltd. All rights reserved.